Cecil Moore wrote:
Jim Kelley wrote:

I now acknowledge knowing of two such people who believe in energy in
nonexistent waves.


Your attempt at obfuscation is well known to all, Jim.

It is your propensity for baseless accusation that is well known
around here, Cecil.

Two canceled waves cease to exist but the energy in the
two waves that canceled cannot cease to exist.

I'm sorry you're having so much trouble understanding such a simple
idea. It really does turn you surly. The waves don't 'stop
existing'. Given the conditions, they can never exist. In the steady
state, things don't first do one thing, and then some time later do
something else.

ac6xg

Jim Kelley wrote:
Two canceled waves cease to exist but the energy in the
two waves that canceled cannot cease to exist.

I'm sorry you're having so much trouble understanding such a simple
idea.

The idea that canceled reflections never existed in the
first place is not a simple one. If they never existed
in the first place, there is no reason to ever try to cancel
them because there was never anything to cancel. In effect,
you are saying the lack of reflections causes the reflections
never to have existed. Not only is that confusing cause and
effect but it also introduces time travel. "If you went back
in time and killed your grandfather before you were born,
you would cease to exist." But if you never existed, who
killed your grandfather? That's the exact logic that you
are using.

It really does turn you surly. The waves don't 'stop existing'.

Yes, they do. They stop existing in their original direction
of travel. A reflected power meter proves it. A forward power
meter proves that the energy that existed in the canceled
waves joined the forward wave. What is it about the Melles-
Groit and FSU redistribution of energy explainations that
you don't understand?

Given the conditions, they can never exist.

If reflections never exist, there is no need for a non-
reflective coating, is there? People who buy non-reflective
picture frames are wasting their money since the reflections
never exist. What is it about the Melles-Groit and FSU
explainations about redistribution of energy from the
canceled waves that you don't understand?

In the steady state, things
don't first do one thing, and then some time later do something else.

I've explained this before. Wave cancellation is a continuous
steady-state process. Ptot = P1 + P2 - 2*SQRT(P1*P2) = 0
is a continuous process. Every dt, waves P1 and P2 are
in the process of canceling each other during steady-state.
--
73, Cecil http://www.w5dxp.com

Cecil Moore wrote:

Jim Kelley wrote:

I'm sorry you're having so much trouble understanding such a simple
idea.


The idea that canceled reflections never existed in the
first place is not a simple one.

Just cut the BS, Cecil. In order to prove your assertion you must
first be able to describe how two co-linear, coherent waves that are
180 degrees out of phase at every point along their path and traveling
in the same direction can under those circumstances at any time
produce measureable energy. In addition, you must be able to measure
it. Let me know when you do.

ac6xg

PS - I'd like to suggest that you ask Dr. Barrans to explain to you
what 'Up + Down = Nothing' means.

Richard Clark wrote:
"Perhaps others will join in."

Haven`t read all the postings and don`t propose to contradict anyone.
Radio waves are energy in motion. They continue so long as their supply
does.

The same energy can`t be in two places at once. Energy can be
redirected. Practical antennas are an example. The only non-directional
antenna is the imaginary isotropic radiator which if it were constructed
would by definition produce waves of equal strength in all directions.
Terman says on page 871 of his 1955 opus:
"Thus a gain of 4 (or 6dB) means that the power intensity is 4 times as
great (field intensity twice as great) as would be the case if the
radiator in question were an isotropic antenna radiating the same total
power."

The foregoing tells us power phased-out in some directions is redirected
to a direction of maximum radiation. Constructive interference exactly
equals destructive interference because a fixed amount of power is
available and conservation of erergy must be satisfied.

The same is true on a transmission line whose only possible directions
are forward and reverse.

Best regards, Richard Harrison, KB5WZI